Tuning tensile strain on FinFET
First Claim
1. A semiconductor device comprisinga first device of a first conductivity type, the first device having a first gate electrode, first sidewalls of the first gate electrode having a first profile;
- anda second device of a second conductivity type, the second device having a second gate electrode, second sidewalls of the second gate electrode having a second profile, the first profile different than the second profile, a first channel length of the first device being less than a second channel length of the second device, the first conductivity type being opposite the second conductivity type, the second sidewalls being adjacent a contracted dielectric, the contracted dielectric having a concave sidewall adjacent the second sidewalls.
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Abstract
A fin field effect transistor (FinFET) having a tunable tensile strain and an embodiment method of tuning tensile strain in an integrated circuit are provided. The method includes forming a source/drain region on opposing sides of a gate region in a fin, forming spacers over the fin, the spacers adjacent to the source/drain regions, depositing a dielectric between the spacers; and performing an annealing process to contract the dielectric, the dielectric contraction deforming the spacers, the spacer deformation enlarging the gate region in the fin.
20 Citations
20 Claims
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1. A semiconductor device comprising
a first device of a first conductivity type, the first device having a first gate electrode, first sidewalls of the first gate electrode having a first profile; - and
a second device of a second conductivity type, the second device having a second gate electrode, second sidewalls of the second gate electrode having a second profile, the first profile different than the second profile, a first channel length of the first device being less than a second channel length of the second device, the first conductivity type being opposite the second conductivity type, the second sidewalls being adjacent a contracted dielectric, the contracted dielectric having a concave sidewall adjacent the second sidewalls. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising
a first device of a first conductivity type, the first device having a first gate electrode, the first gate electrode having a first dielectric layer on opposing sides thereof, first sidewalls of the first gate electrode having a first profile, the first profile having linear sidewalls; - and
a second device of a second conductivity type, the second device having a second gate electrode, the second gate electrode having a second dielectric layer on opposing sides thereof, second sidewalls of the second gate electrode having a second profile, the first profile different than the second profile, a first channel length of the first device being less than a second channel length of the second device, the second profile having convex sidewalls projecting toward the second dielectric layer, the second dielectric layer being a contracted dielectric layer having concave sidewalls, the first conductivity type being opposite the second conductivity type. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A semiconductor device comprising
a first device of a first conductivity type, the first device having a first gate electrode, first sidewalls of the first gate electrode having a first profile; - and
a second device of a second conductivity type, the second device having a second gate electrode and source/drain regions on opposing sides of the second gate electrode, the second device having a contracted dielectric disposed over the source/drain regions, the second device having spacers interposed between the second gate electrode and the contracted dielectric, second sidewalls of the second gate electrode having a second profile, the first profile different than the second profile, a first channel length of the first device being less than a second channel length of the second device, the first conductivity type being opposite the second conductivity type, the contracted dielectric having a concave sidewall facing toward the second gate electrode. - View Dependent Claims (17, 18, 19, 20)
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Specification